Air supply grill



Oct. 20, 1953 G. K. J. BROBEVRG AIR SUPPLY GRILL Filed Aug. 17, 1949 FIG. 1

Patented Oct. 20, 1953 AIR SUPPLY GRILL Georg Karl Johan Broberg, Solna, Sweden, assignor to AB Svenska Flaktfabriken, Stockholm, Sweden Application August 17, 1949, Serial No. 110,857 In Sweden August 25, 1948 Claims.

The invention hereinafter described as reference to discharge grills, especially for air, which consist of a frame having members mounted therein and forming discharge slots between them.

The object of the invention is to provide an improved grill construction, where the improvement primarily concerns the construction of the members forming the slots in the grill with the possibilities of variation with regard to the form of the members, which this implies, and the arrangement of the members in the grill framework.

The arrangement according to the invention is characterized in that the members are made of plates of metal or other material which are bent so, that in a section in angular position to the bending edge they have two legs, the free ends-of which extend generally in the same direction. The curvilinear base can be semicircular in section and the legs can be plane, form an acuate angle, and of the same or of differing length. In one and the same grill some of the members can have legs of the same length and others those of differing length. The members are suitably made of sheet material with the same dimensions irrespective of whether the legs are of the same or of differing length. Whether the members are manufactured in the last-mentioned way or not, they are preferably mounted in the frame in such a way that curvilinear bases of the plates are disposed tangent to a common plane surface with the free end edges of the leg portions likewise disposed in a common plane. The material for the production of the members is suitably a plane rectangular plate of easily bendable material, whereby the plate edges are preferably rounded off. The members can be mounted in the frame in different ways, so that the openings between them direct the passing currents of air in different directions, for instance straight forward, to one or the other side or spread all the air currents of the grill fan-shapedly. The legs of the members extend suitably with their free ends a little bit outside the frame.

The method according to the invention substantially concerns the way of bending with the same tool the plates of one and the same plate material with fixed dimensions into the desired form, thereby obtaining legs of the same or of differing desired length as it may be desired.

An embodiment of the invention is illustrated in the accompanying drawing, where:

Fig. 1 represents the front of an air supply grill,

Fig. 2 a horizontal section of this and Fig. 3 a vertical section of the same grill.

Fig. 4 shows in section how the bending of the plates is carried out.

In the drawing 5 designates a rectangular frame, which is provided with a flange 6 around the front. Members in the form of bent plates 1 of generally U-cross-sectional shape are placed across the frame opening. These members have a curvilinear base portion 8 and almost parallel sides or legs 9 and in. Some of the members have legs 9, H] of the same length, whereas others have one leg longer than the other. The spaces between adjacent members form slots in the grill for a medium to pass through. In Fig. 2 the members are so made that the curvilinear base portion 8 of the members are tangent to a common plane and similarly the free edges of the leg portions of the member are disposed in a common plane surface. For this purpose materials of different sizes for the plates are necessary. According to the invention, however, equal sized material can be used for all of the members. The members can then be so mounted in the framework, so that either the curved base portions and/or the free edges of the legs will lie in a common plane. The material for the plates is here a piece of a plane rectangular plate, which is bent into the desired form. The edges of the material or the intended front edges of the legs can be rounded from the beginning. In Fig. 2 the members are so placed that the openings formed by them spread fan-shapedly a medium passing through the grill. It is sufficient if the members are fabricated with groupwise increasing angle of dispersion. The members are attached to the frame by welding, soldering, deformation or in another mechanical way. It is to be noted that in Figures 1-3 the legs 9, ill of the members extend a little bit outside the plane of the frame. Owing to this the legs of one and the same member will form a channel between two discharge openings of the grill, to which channel the air from the space above and below the grill always has free passage. As the air in the channel is constantly carried away by the air passing through the grill and the air in the channel is all the time renewed by the air flowing downwards and upwards, the supplied air and the air within the supply space will thus be mixed very well. The direction of the air flow supplied through the grill is indicated by arrows in Fig. 2.

Fig. 4 shows bending the plates. The plane plate material H is placed between a patrix (punch) l2 and a matrix I3, which are pressed against each other, whereby the plate material is given the form it illustrated in dash-dotted lines in the figure. By moving the shown plane plate material II in Fig. 4, to the right or to the left before the pressing, members with legs of different lengths utilizable to one and the same grill are obtained.

Having now described my invention, what I claim as new, and desire to secure by United States Letters Patent, is:

1. A grill construction comprising a frame having a wall defining an opening therein, a plurality of members of generally U-cross-sectional shape mounted in said frame in parallel spaced relation across the opening therein, said U-shaped members each comprising a curvilinear base portion and a pair of plane leg portions extending perpendicular to the direction of parallel spacing of the members and spanning the opening between the frame wall with said leg portions extending from the base portion outwardly through the frame opening with their free end edge. portions only projecting a. short. distance beyond the said frame, the leg portions of each member being slightly divergent with respect to. each other outwardly from the base portion, and said divergent leg portions defining with. the leg portions of adjacent members and the intermediate frame wall tubular discharge passages. which are convergent outwardly.

2.. A grill construction comprising a frame having a wall defining anopening therein, a plu rality of members of generally .u-cross-sectional shape mounted in said frame in parallel spaced relation across the opening therein, said U-shaped members each comprising a curvilinear base portion disposed tangent to a common plane and a pair of plane leg portions, the base and plane leg portions of the member extending perpendicular to the direction of parallel spacing of the members and spanning the opening between the frame wall with said leg portions extending from the base portion outwardly through the frame open.- ing with their free end edge. portions only pro iecting a. short distance beyond the said frame, the leg portions of each member being slightly divergent with respect to each other outwardly from. the base portion, and said divergent leg portions defining with the leg portions of adjacent members and the intermediate frame wall tubular discharge passages which are. convergent outwardly.

3. A grill construction comprising a. frame. having a wall defining an. opening therein, a plurality of members of generally U-cross-sectional. shape mountedin said frame in parallel spaced relation across the opening therein, said U..- shaped members each comprising a. curvilinear base portion and a pair of plane leg portions extending perpendicular to the direction of par-- allel spacing of the members and spanning the opening between the frame wall with. said le portions extending from the base portion outwardly through the frame opening with their free end edge portions only projecting a short distance beyond the said frame and disposed in a common plane, the leg portions of each member being slightly divergent with. respect to each divergent leg portions defining with the leg portions of adjacent members and the intermediate frame wall tubular discharge passages which are convergent outwardly.

4. A grill construction comprising a frame having a wall defining an opening therein, a plurality of members of. generally u -cross-sectional shape mounted said. frame in. parallel spaced relation across the opening therein, said U-shaped members each comprising a curvilinear base portion and a pair of plane leg portions extending perpendicular to the direction of parallel spacing of the members and spanning the opening between the frame wall with said leg portions extending from the base. portion outwardly through the frame opening with their free end edge portions only projecting a short distance beyond the said frame; each succeeding member outwardly in opposite direction from the central-most member being disposed at a greater acute angle than the preceding inner member, and the adjacent leg. portions of adjacent members and the intermediate frame Wall cooperating to define tubular discharge passages which are directly fanshapedly.

5. A. grill construction comprising a frame having a wall defining an opening-therein, a plurality of members of generally U-cross-sectional shape mounted in said frame in parallel spaced relation across the opening therein, said U-shaped members each comprising a curvilinear base portion disposed tangent to a common plane and a pair of plane leg portions, the base and plane leg portions of the member extending perpendicular to the direction of parallel spacing of the members and spanning the openingbetween the frame Wall with said leg portions extending from the base portion outwardly through the frame opening with their free end edge portions only projecting, a short distance beyond the said frame and disposed in a common plane, the leg portions of each member being slightly divergent with respect to each other outwardly from the base portion and defining with-the leg portions of adjacent members and the intermediate frame wall tubular discharge passages which are convergent outwardly, and each succeeding member in opposite directions from the central-most member beingdisposed at a greater acute angle than the preceding inner member to thereby define discharge passages which are directed fan-shapedly.

GEORG KARL JOHAN' BROBERG.

References Cited in the. file of this. patent UNITED STATES PATENTS Number Name. Date 1,671,107 Fric-ker May 29, 1,928 2,031,982 Salzman Feb. 25, 1936 2,224,312 ODay s Dec. 10-, 1940 2,300,574 Jepertinger Nov. 3, 1942 2,339,629 Fischer, Jr. Jan. 18, 194.4 2,339,855 Hodi'l et al. Jan. 25,, 19.44. 2,525,157 Trane F Oct. 10,, -0

FOREIGN PATENTS Number Country Date 533,139 Great Britain. Feb. 6, 1941 

